[Nix-dev] Pass arguments to 'required' configs

[Nicolas Pierron]

Hi Sergey,

If you are not using the proxy_port and proxy_host values for
selecting the modules, I suggest you use the module system instead.
This means that your previous example would become something like the
example below. This solution is a bit more verbose, but you might be
able to introspect these options with nixos-option command line tool
and NixUI.

// configuration.nix
{
  require = [
    /etc/nixos/configuration.nix
    ./include/global_bash_aliases.nix
  ];

  custom.go.proxy.port = 4343;
  custom.go.proxy.host = "myproxy.local";
  …
}

// ./include/global_bash_aliases.nix

{ config, pkgs, lib, ... } :

with lib;
{
  options = {
    custom.go.proxy.port = mkOption {
      default = 4242;
      example = 4343;
      type = types.uniq types.int;
      description = ''
        port number used by the goproxy shell alias command.
      '';
    };

    custom.go.proxy.host = mkOption {
      example = "example.com";
      type = types.uniq types.str;
      description = ''
        host name used by the goproxy shell alias command.
      '';
    };
  };

  config = {
    environment = {

      extraInit = with config.custom.go.proxy ''
         alias goproxy "nc ${port} ${host}
      '';
    };
  };
}


On Tue, Nov 17, 2015 at 2:17 PM, Sergey Mironov <grrwlf at gmail.com> wrote:
> Hi. This is a follow-up to my previous letter about Private NixOS modules.
>
> Another thing I am missing is the ability to pass arguments to
> 'required' configuration modules. Below is the illustration of the
> idea. Could you please give me some advice on this?
>
> Regards,
> Sergey
>
>
> // configuration.nix
>
> {config, pkgs, ...}:
> let
>   proxy_port = "4343";
>   proxy_host = "myproxy.local";
> in
> {
>   require = [
>     /etc/nixos/hardware-configuration.nix
>     ..
>     (withArguments ./include/global_bash_aliases.nix { inherit
> proxy_port  proxy_host; })
>     ..
>   ];
>  ...
>
> }
>
>
> //./include/global_bash_aliases.nix
>
> { proxy_port, proxy_host} :
> { config, pkgs, ... } :
> {
>   environment = rec {
>
>     extraInit = ''
>        alias goproxy "nc ${proxy_port} ${proxy_host}
>     '';
>   };
>
> }
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-- 
Nicolas Pierron
http://www.linkedin.com/in/nicolasbpierron - http://nbp.name/